Internal-combustion engine



Oct. 16, 1928.

w ww" 40 the compression stroke,

Patented Oct. '16 '1928.

UNITED sTA'rEs PATENT OFFICE;

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Application medV November 0, 1925, Serial Ro. 87,880, and m Germany November 29, 1924. i

- Twoor more-cylinder combustion engines *for two or more cycles and adapted for dislodglng action are known, in which the dislodging piston and '-the working piston are.

5 constructedas two individual pistons', adapted to transmit motion during the expansion stroke and reciprocating in two cylinder's, in-

clined towardseachother. Between the two cylinders, besides the main connectingchannel a second overflow channel is arranged in such a manner, that at the end of -the compression -stroke the main connection channel is 'covered by the dislodging piston and conse-` guentlv the air or gasespresent above said piston are furth'er' compressed an'dkv forced through the overflow channel into the oth'er cylinder for the purpose of-introducing and imixin the fuel. y

is introduced before each working stroke into a recess of the connect-ing channel between two cylinders, which channel leads the air current during the last part of the compres- 'sion stroke; said connecting channel having uniform width at all parts with the exception of the recess. The fuel quantity .introduced into the connecting channel, however, mixes only insufliciently with the air flowing through said channel, the'fine fuel .particles being driven in front of the air current as by a piston, 'without mixing with the air, so that at least the starting of the engine is rendered difficult and in most cases the combustion remains incomplete.

These drawbacks are obviated by this invention, by virtue of which the compressed air-channel is provided with a throttling restriction through Awhich the air current passing throughthe channel towards thefend of flows together with 'at least a portion of the fuelinjec'ted into the channel.4 At least a portion of the fuel injected only towards the end of the compression stroke enters into contact with the current of air, which has been strongly heated by compression, already in advanceof the rew, striction, and, while passing through said re-` striction, is so intimately intermixed with the air that self-ignition takes place.

The i'l'vention, with these objects in view, consists in for'ming` the overflow-channel in theform of a double nozzle, the narrowestl portion of each component nozzle being at or adjacent to the point where the mouth of the fuel-injecting nozzle is located. By such ar- In t e known enginesof this kind the fuel rea``dily` ignitable mixture.

In the accompanying drawing one form of construction of my improved combustion engine isz-illustrated in a diagrammatical M manner invertical section.

In the drawing the reference characters a and bf indicate the two cylinders, while the two pistons are indicated by c andA d and the` combustion spaces by e and f. The overflow 10 channel is constructed as a double nozzle g, that is' to say, as two taperin conduits`orI "funnels whose restricted mout s meet at a point `h at an intermediate point between the twocylinders, a fuel-injectlng nozzle i being also arranged, at an intermediate point, as shown, to inject fuel at the prescribed times into the channel g at or in proximity to the constricted part lt of said channel.

Evcntually lateral auxiliary fuel injecting nozzles lc may be provided, as shown.

The two 'cylinder-spaces e and f are connected with each other, when'the two pistons enter into the shown position of strongest compression, only by means of the channel g, 86 which is nozzle-like and restricted at the p oint h. At'this restriction the fuel nozzle i 1s preferably;` arranged.

As the compression effected by the piston o towards the end of the compression-stroke 00 is greater than the compression efected-by the piston d, air must pass from the space e to the space f through the channel ng. This air current takesalong withtit through the restrictiongk at least a portion of Ithe fuel injected through the injectionnozzle Thereby Jthe fuel-partihcles are well mixed and whirled to- .in contact with injected fuel at the latest at the restriction itself, or, still better, before passing through said restriction.

With'corresptonding changes the arrangei 'ment of the overflow channel in form of a double nozzle can be employed for cylinders arranged abreast of each other and provided With two crank shafts or for engines, the pis tons of which reciprocate in opposite directions, or for radialand multiple-cylinderengines.

I claim:

1. A combustion engine, oomprising, incombination a pair`or plur'ality of pairs of cylinders, a main connection channel between each pair of cylinders, a further overflow channel between said pair of cylinders and a nozzle adapted to feed the fuel to said overflow channel,- the latter being shaped in the form of a double nozzle, the narrowest parts of which are at or adjacent .to the'injection 15 nozzle.

2. In a combustion engine comprising two cylinders and pistons working therein at different degrees of compression, a channel for conveying compressed air from the combus tion space of one cylinder toward that of the other, said channel being formed as two tapering conduits Whse restricted portions meet at an intermediate point betweendhe two cylinders in combination with means for injecting fuel into |said channel also at an intermediate point.

In testimony Whereof I have hereunto affixed my signature.

'FRANZ LANG. 

